Explanation
Thus option II and IV are correct.
The enzyme cytochrome c-oxidase is a large transmembrane protein complex found in bacteria, archaea, and in eukaryotes in their mitochondria.
It is the last enzyme in the respiratory electron transport chain of cells located in the membrane. It receives an electron from each of four cytochrome-c molecules, and transfers them to one dioxygen molecule, converting the molecular oxygen to two molecules of water. In this process it binds four protons from the inner aqueous phase to make two water molecules, and translocates another four protons across the membrane, increasing the transmembrane difference of proton electrochemical potential which the ATP synthase then uses to synthesize ATP.
Hence, the correct answer is 'Cytochrome c-oxidase'.
In cyclic electron transport pathway:
1. The P$$_{700}$$ pigment complex absorbs solar energy. They transfer their energy to PS I reaction centre- P$$_{700}$$. The outer valance electron of excited P$$_{700}$$ is raised to a higher energy level which is captured by the primary acceptor of PS I. The primary acceptor transfers electron to ferredoxin.
2. Reduced ferredoxin, unable to reduce NADP$$^+$$ returns the electron to PS I via cytochrome b$$_6$$, plastoquinone (PQ), cytochrome-f and plastocyanin.
3. The electron transport is called cyclic because the electron emitted from PS I returns back to PS I passing through several intermediate carriers.
Hence, the correct answer is 'Cyt.b6'.
Photorespiration is a process that certain plants undergo and it involves the loss of carbon. It wastes oxygen and results in a loss of carbon in the form of carbon dioxide production.
So, the correct answer is '100%'.
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